Physical Review Letters
We analyze the quantum dynamics of a micromechanical resonator capacitively coupled to a Cooper-pair box. With appropriate quantum state control of the Cooper box, the resonator can be driven into a superposition of spatially separated states. The Cooper box can also be used to probe the decay of the resonator superposition state due to environmental decoherence.
Armour, A. D.; Blencowe, M. P.; and Schwab, K. C., "Entanglement and Decoherence of a Micromechanical Resonator via Coupling to a Cooper-Pair Box" (2002). Open Dartmouth: Faculty Open Access Articles. 2017.